Typewriter



Nov. 13, 1928. 1,691,063

O. A. HOKANSON TYPEWRITER Filed sept. 22, 1924 8 She-etlsht 2 fida/ivf Ym a MM Nov. 13, 1928.

o. A. HoKANsoN `TYPEWRITER Filed SePt- 22. 1924 8 She-i-Sh'e lill f TTMd, NQ

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,x ENFIN@ Nov. 13, 1928.

O. A. HOKANSON TYPEWRI TER Filed Sept. 22. 1924 8 Sht-Shee 4 MQ www QQNov. 13, 1928.

l O. A. HOKANSON TYPEWRI TER O. A. HOKANSON Nov. 1 3, 1928.

TYPEWRITER Filed Sept-22, 1924 8 Sheets-Shet 6 fau/622701 @gas Nov. 13,1928.

O. A. HOKANSON TYPEWRITER 8 Sheets-Sheet '7 Filed Sept. 22, 1924Patented Nov. 13, 1928.

UNITED gsTMrss PATENT OFFICE. 'f1 l OTTO A. HOKAN'SON, OF WOODSTOCK,ILLINOIS, ASSIGNOR TO WOODSTOCK TYPEWRITEB;

COMPANY, 0F WOODSTOCK, ILLINOIS,v A CORPORATION OF ILLINOIS.

TYPEWRITER.

Application led September 22, 1924. Serial No. 738,982.

the impressionv ribbon.

' Other objects of the invent-ion will appear hereinafter.

The inventionA is exemplified in the combination and arrangement ofparts shown 1n the accompanying drawings and described in the followingspeciiication, and it is more particularly pointed out 'in the appendedclaims. f

In the drawings" Fig. 1 is a vertical sectional view,with parts inelevation, showing a portion of a type'- writer having one embodimentofthe present invention applied thereto; f

Fig. 2 is a horizontal section substantially on line 2-2 of Fig. 1; f c

Fig. 3 is a section similar to Fig. 1 but showing some of the partsron alarger scale;

Fig. 4 is a vertical section substantially on i une 4 4 OfFig. 5;

Fig. 5 is a horizontal section substantially on line 5 5 of Fig. 3; f

Fig. 6 is a vertical section substantially on line 6 6 of Fig. 5;

Fig. 7 is a vertical section line 7-7 of Fig. 5;` f -Y Fig. .8 is a rearelevation ofthe line iinder substantially on and ribbon carrier,together with associated parts; n

Fig. 9 is a horizontal section substantially on line 9-9 of Fig. 8

Fig. 10 is a horizontal section substantially online 10-'10 of Fig. 8;

Fig. 11 is a front elevation of 4the parts shown in Fig. 8;

Fig. 12 is a vertical section on line 12-12 of Fig. 11, with parts inelevation;

Fig. 13A is a horizontaly section substantially 'on line 13-13 of Fig.11; and j Fig. 14 is a section on line 14-14 of Fig. 13. In front striketypewriters it is customary to provide ribbon vibrator mechanismactuated usually by the type bars for moving the ribbon over theprinting-point to receive the impression at the time that the typestrikes the platen, the ribbon being withdrawn after eachirnpression topermit easy visibility. *ItV 1s common to employ attwo-color ribbon andto provide means for shlfting eithery zone of theribbon overthe printingpoint so that the i writing ymay bel in either one of the two colors,asdesired. It is also desirable to permit operation of the type barswithout Inoving the ribbonto the printing point for cutv ting stencils.The present invention provides'1 means forv accomplishing all of theseresults i and Vin addition provides a positive stop for the ribbonvibrator which is controlled by the line vfinder sothat thereis nodanger of over-y throw of the ribbon vibrator. This prevents anypossibility of overlapping -of the colors in the ribbon whether thewriting is in upper or lowerl case. v Y

Referring first to Fig. lof the drawings, the numeral 15 designates thetop plate of a VVoodstock7 typewriter, although it will be j understood,of course, that the invention may be applied to other makes. kA type barsegment 16 having type bars 17 pivotedrthereon universal bar 18 lies inthe path 'ofthe type bars 17 and is operated thereby in a .manner nectedby rearwardly extending members 19 vwith a universal bar frame 20whichis pivot-` y ally supported at 21 by links V22, the linkspbeing pivotedat 23 tothe frame15.

As shown best in Figs. 5, 6 and 7, the frame 'is supported on the frame15. An arcuate 20 is provided.' with an irregularly shaped plate 24secured to its underface by rivets 25.

A second plate 26 is adjustably secured to the frame 20 by screw andslot connections 27.

yA forwardly extending arm 29 is pivoted at 30 tothe lower face oftheplate 26, theplate 26 being bowedvupwardly at its center to admit the,end of the arm29 between the plate 26 and theframe 20. The platek 26hasan integral tongue 31 overlying the arm 29l and having a headk 32 whichbears upon a pivot screw 41 carried by the arm 29, as will be describedlater. The tongue 3l is for the purpose of preventing any upwardyielding ofk i* the arm 29 vunder the force applied thereto through theattached parts to vbe described...`

The `arm 2,9.v at its forward vend is provided with a pair of spacedears 36 and 37 having slots 38 and 39, respectively, therein, as shownbest in Fig. 6. An arm 40 is pivoted at 41 tothe f y' arm 29 and has itsopposite end pivotally contor lever. The slot-s are'also given theproper angular position to properly position the ribbon vibratorrelative to the platen and to impart the same amount of movement theretoirrespective of the vertical position of the platen.

-l The'lever 57 is provided with a slot 96 at its forward end tol whicharibbon carrier 97 is secured by means of a pin 98. The type bar segment16 is recessed on its rear face, as shown at 99, to receive the carrier97 and the segment also carries a plate 100 at its top portion providedwith type bar guides 101. The carrier 97, as shown in ig. 8, is

provided at its upper end with spaced bifurcations 102 which are guidedby flanged lugs 103 carried by the plate 100 and overlapping the outeredges of the bifurcations 102. vThe bifurcations 102 are provided withloo-ps 104 at their upper ends for receiving the ribbon. AV slot 105 inthe carrier 97 receives a pin 106 for assisting in guiding the carrierin its up and down movement. The upward movement of the carrier islimited by a pin 11 107 secured to the rear face thereof near its lowerend in position to engage a stop plate 108. In order that the uppermovement of the ribbon may always be arrested in the same definiteposition relative to the printing line the stop plate 108 is mounted onthe support for the line finder 109@v This support comprises a plate 110having arms 111 extending upwardly therefrom. The line finder 109 has anupper horizontal edge 112 for indicating the line lposition 'and isprovided with an opening 113 for receiving the type bars, therey beingan inverted V-shapcd portion 114 bridging the upper part of the opening113 to assist in holding the paper in' position at the printing point.The stop plate 108 is slidably mounted on the supporting plate 110 byslots 115 and headed rivets 116. The plate 108 is provided'with twostopedges 117 and 118 which are offset relative to one another for arrestingthe ribboneither for black or red. The same movement of the linger piece86 which shifts the slotted loops 36 and 37 also shifts the stop plate108 to bring/the proper stop shoulder into operative relation-to the pin107 corresponding to the amplitude of'vibrationimparted by the slots 38and 39. The movement of the plate 108 is effected by the bell cranklever 93 whicli,as'p1eviously explained,

has one arm connected withthe forwardly wardly thereon without beingdisengaged therefrom when the stop plate 108 is moved wardly duringcase-'shift movement in order i to maintain its proper relation with theplaten and since the stop plate 108 is mounted on'the line findersupport, the stop plate also moves A in unison with the line finder andplaten.v t

The upward movement of the line finder is produced by means of a bellcrank lever 122 securedto a shaft 123 pivotally supported on bracketarms 124 extending downwardly and rearwardly from the bracket plate 125secured to the .frame member 126 by screws 1 127. One of the bracketarms 124 is provided` with an extension 128 having a lug 129 on whichthe Abell crank lever 93 is pivoted at 130, as shown best in Fig. 9. Thelower arm ofthe bell crank lever 122 is pivotally connected to a link131 vwhich is formed in sections held in adjustable relation to `oneanother by screws 132. The rear end of the link 131is pivotallyconnected to a downwardly extending arm 133 carried at one side ofthebracket 55. It will be understood from Figs. 3 and 12 that oscillationof the shaft 47 to shift the platen vwill at the same time rmove the arm133 to impart oscillation to the bell crank lever 122 and vthus raisethe line finder support to maintain the line finder in fixed relationwith the platen. The position of theline finder relative to the platenmay be'adjusted by adjusting the length of the link 131'by means of thescrews 132, there being vproper slots arranged in the link 131 to permitof :such adjustment.` The line finder support 110 vis provided withrearwardly projecting ears 134 which are pivoted at 135 to the'bellcrank lever 122 and to an arm 122 secured to the shaft 123 at the endthereof opposite the lever 122.V The plate rotate the line findersupport about the pivots 135 so as vto resiliently press the upper edgeof the line finder 109 against the platen.

Supplemental means for exerting addillll tional forceV upon the linefinder support is shown in Figs..11, 12 and 13. Thissupplementall meanscomprises 4a pairof spring arms 139 having rollers 140 journaled there-`on vin position to engage the upwardly eX- tending arms 111 of the lineiindersupport. The spring arms 139'normally hold the rollers away fromAthe supporting arms 111 but n the arms 139 are provided withdownwardlyv extending Contact members 141` which are arranged in thepath of camV faces 142 on slides 143. These slides are provided with avscrew and slot connection 144 with thetop surface of the type barsegmentV 16. When f the slides 148 are moved inwardly the rollers 140will be pressed against the uprights 111 thus forcing the line finder109 rmly against the front of the platen. Spring plates 145 are disposedbeneath the slides 143 and are adjustably held in position by the screws144. The springs 145 have stop lugs 146 struck up therefrom to limit themovement of the slides 143 and also have their ends 147 bent upwardly toprovide spring friction contact with the slides to retain them inanyposition to which they may be moved to produce the required pressureon the line. finder. The slides may, of course, be moved outwardly bythe operator when it is desired to release the extra pressure upon theline finder.

The downward movement of the vibrator is limited by a stop 148 pivotedat 149 to one arm of the bracket and provided with a screw and slotconnection 150 for adjusting its position. The stop 148 is provided witha shoulder 151, Figs. 5 and 6, which engages the front edge of theupwardly extending` arm 59. The position of the stop shoulder 151 may beadjusted by swinging the stop about its pivotal support 149, theshoulder being held in its adjusted position by the screw 150. The stopshoulder 151 is adj usted so that it holds the vibrator 57 in properposition to bring the pins and 61 in registration with their slots 38and 39 when the platen is in its upper position. This will hold the pinsin place to re-enter their slots when the member 29 is shifted while theplaten is in upper position. When the platen is lowered the change inthe relation of the parts would permit the vibrator 57 to drop slightlybelow the position in which the slots and pins register and to preventthis an additional stop 152 is adjustably supported from the frame ofthe machine by a bracket arm 153 in position to engage the lower edge fthe lever 57 when the platen is lowered.

The line finder 109 is preferablyV made of thin spring steel, but sinceit is made separately from its support 110 and 111,7the parts may bemade of different material thusmak` ing it possible to temper the part109 much more readily than if the parts were all integral. The use ofthe spring 137 makes it unnecessary to form the parts 110 and 111 ofspring material and the slotted connection between the finder and itssupport permits adjustment of the edge 112 independently of the support.

An eccentric screw 154 forms the pivotal connection between the arms 131and 133 to permit adjustment of the position of the airis of this pivot.By rotating this screw the pivotal axis may be shifted to accuratelylocate it in the proper position to cause the line Vfinder to travelupwardly in exact unison with the platen. Moving the pivotal center atthispoint adjusts the relative speed of the line finder and platenduring case shift so that the adjustment may be used to correct anyslight difference in their rates of movement.

l claim 1. ln a typewriter. a. ribbon vibrator including a ribbon guide,a line finder, and a stop for said ribbon vibrator connected with saidline finder, said ribbon vibrator having an abutment in fixed relationwith said ribbon guide for contacting with said stop.

2.` In aA typewriter, a ribbon vibrator including a ribbon guide, a`line finder, and means connected with said line finder for limiting themovement of said vibrator at a definite position in its movementrelative to said line finder. said ribbon vibrator having` an abutmentin fixed relation with said ribbon guide for contacting with said stop.

8. ln a typewriter, a` ribbon vibrator, means for imparting differentamplitudes of movement to said vibratorfa. shiftable platen carrier,line finder, means for shifting said line finder when said platencarrier is shifted, and stop mechanism connectedwith said line finder toshift therewith for arresting the movement of said vibrator in differentdeiinite positions relative to saidline finder corresponding to thedifferent amplitudes of movement imparted to said vibrator.

4. ln a typewriter, a ribbon vibrator, a universal member for actuatingsaid vibrator, a connection between said universal meniber and vibrator.said connection being variable at the will of the operator for impartingdifferent amplitudes of movement to said vibrator, a line finder, meansfor imparting case shift movement to said line finder, and stopmechanism connected with said line finder to shift in unison therewith.said stop mechanism being adjustable relative to said line iinder forarresting said vibrator at different positions correspending` to thedifferent amplitudes of movement imparted to said vibrator.

5. ln a typewriter, a shiftable platen. a ribbon vibrator, means forimparting different amplitudes of movement to said vibrator. a. linefinder, means for shifting said line finder in unison with said platen,and adj ust able stop mechanism connected to shift with said line finderfor arresting said vibrator in different positions relative to said linefinder. the positions being' the same relative tosaid line finderirrespective of the position of said line iinder.

6. In a typewriter, a shiftable platen, a ribbon vibrator, a. linefinder, means for shifting said vibrator and line 'Finder in unison withsaid platen, means for imparting` different amplitudes of movement tosaid vibrator irrespective of the position of sait platen. andadjustable stop mechanism coin nccted to shift with said line finder forposig tively arresting the movement' of said vibrator in definitepositions relativeV to said line lever having one end thereof pivotallyconfinder irrespective of the position of said platen and line finder.

7 In a typewriter, a platen, means for shifting said platen, a ribbonvibrator piv- ,otally mounted on said shifting means, a

universal member, means for connecting said universal member with saidvibrator at different distances from the pivotal support therefor, andan adjustable stop mounted on said platen shifting means for Ylimitingthe return movement of said vibrator.

8. In a typewriter,y a line inder, a support for said line finder formedseparately therefrom and secured thereto, anda spring for exertinglpressure on said support to resilienti frame for shifting said platen, aline finder, a lever having one arm thereof pivotally connected withsaid line finder, a connection between said frame and the other arm ofsaid lever to cause said line finder to' move in unison with saidplaten, said connection being pivoted to said other arm at a pointspaced from the pivot of said lever, and a spring for resilientlypressing said line finder about its pivotal connection with said leverlto hold said line finder against said-platen.

l1. In a typewriter, a shiftable platen, a line finder forengaging'saicl platen, a frame for shifting said platen, a lever havinga fixed fulcrum and having one end thereof pivotally connected with saidline finder, a link connecting the other end of said lever with saidplaten shifting frame, a Spring for moving said line finder about itspivotal connection with said lever to hold said line finder against saidplaten, a fixed abutment for said spring, `a ribbon vibrator, anda limitstop for said vibrator connected with said line finder support.

12. In a typewriter, a platen, a frame for shifting said platen tochange from one case writing to another, a line finder, a bell cranknected with said line finder, a link connecting the other arm of saidbell crank lever and said shiftable frame, said link being adjustable toregulate the position of said line finder relaj tive to said platen, aspring for forcing said'A line finder against said platen and a fixedabutment for said spring.

i 13. In a typewriter, a line finder support, a ribbon vibrator, a limitstop slidably mounted on said-line finder support, means for shiftingsaid line finder support in unison with said platen, and means formoving said -limit stop to different position on said line findersupport irrespective of the position of said line finder support. Y d d14. In a typewriter, a shiftable platen, a ribbon vibrator, means foractuating said vibrator to imp artdiiferent amplitudes Vof movementthereto, a line finder support, anda limit stop slidably mounted on saidline finder support and having means thereon for positively y arrestingsaid vibrator at differentpositions relative to said line findersupport.

15. In a typewriter, a shiftable Vplaten a ribbon vibrator mounted toshift with said p laten, means operable irrespective of the position ofsaid platen for imparting different throws to said vibrator, a linefinder, means for shifting said line finder in unison with said platen,a limit stop connected to shift with said line finder and having'meanstherev on for arresting said vibrator at different positions, and meansfor shifting said limit stop,- said shifting means having slidingconnection with said limit stop to permit operation thereof fordiiferentpositions ofsaid line finder.

16. In a typewriter, a platen, a line finder, resilient means forpressing said line i'inder against said platen, a supplemental pressuredevice for engaging said line finder, and a member having a cam face forpressing said supplemental device against said line finder.

17. In a typewriter, a platen, a line finder, a spring Aarm having laroller thereon positioned adjacent said line finder but held lby,

said arm out of contact therewith, and means for forcing said deviceagainst said line finder to exert supplemental pressure von said, linefinder. Y

18. In a typewriter, a platen, a line finder,

means for holding said line finder against said platen, a supplementaldevice for exerting pressure against said lineiinder, anda slide havinga cam face forl actuating said supplemental device. n

19. In a typewriter, a line finder, a supplemental device for exertingpressure on said line finder, `and a pair of contact membersl movabletoward one another to actuate said supplemental device.

20. In atypewriter, aline finder, a pair of vspring varms having rollersthereon for engaging ,said line finder, and a pair of slides- Vmovabletowardl one another forpressing said rollers against said line finder.,said slides having shoulders thereon for retaining said'- rollers inengagement with said line finder.

In testimony whereof I have' signed my name to this speciiicationonthislSth day of September A. D. 1924:.

OTTO A. HOKANSON.

